<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style>
			body{
				margin: 0;
				display: flex;
				justify-content: center;
				align-items: center;
				height: 100vh;
			}
			div{
				width: 300px;
				border: 1px solid #000;
				margin: 300px auto;
				/* text-align: center; */
			}
		</style>
	</head>
	<body>
		<!-- 
			text-align ：对文本内容水平对齐
			margin : x auto; 快速在父级谁平局中
			弹性布局比较灵活
		-->
		<div>东软睿道</div>
	</body>
</html>
